Reproducer for phonographs.



I PATENTED FEB. 25, 1908. A. o. MESTRAUD. 1 RBPRODUGBR FOR PHONOGRAP'HS.

APPLIOATIOK FILED JUNE 18, 1907.

2 8HEETSBHEET 1.

PATENTED FEB. 25, 1908.

A. c. MESTRAUD. REPRODUGER PORPHONOGRAPHS.

APPLIOATION FILED JUNE 18,1907.

2 SHEETS-SHEET 2.

Wi tn eases ARTHUR G. MESTRAUD, O.F' LINCOLN, NEBRASKA, AS STGNOR LINQOLN, NEBRASKA.

'ro osoAR' J.- JUNGI), or;

REPRODUCER FDR PHCNOGRAPHS.

p fi a i n oif Letters retest. i Application filed June 18. 1907. "Serial No. 379.617.

. PatentedjFeblQlS, 1908.

To all whom 'it may concern:

'Be it known that I, ARTHURC. MESTRAUD, 1

a citizen of'theUnited States, residing at Lincoln, in the county of Lancaster and. State of Nebraska, have invented new and useful Im rovements in Reproducers for Phonograp s, of which the following is aspecification.

This invention relates to reproducers for phonogra hs, and one of the principal objects of t e same is to obviate the use of a counterweighted stylusarm in devices of this character.

' Another object of the invention is to provide a reproducer or sound box in which the stylus arm is mounted upon a spring,'and in which means are provided for adLustingdthe e yie tension of the spnn to regulate t ing character of the sty us arm.

Still another object of the invention is to provide a reproducer of simple construction 111 which weights are entirely dispensed with,- andin which the spring for supporting the stylusarm may be quickly adjusted t0regu' late the bearing ofthe stylus'in the sound grooves of the record.

, These and other objects may be attained by means of the construction. illustrated in the accompanying drawin s, which:

Figure 1 is a central reproducer or sound box made in accordance with my invention. Fig. 2 is an underside plan view of the same. Fig. 3 is a detail side view of the limit loop for su porting one end of the stylus arm spring. 1g. 4-is a detail front elevation of the spring-holding meme bers. Fig. 5 is a sectional view of'the same, taken on the line 5-5, of Fig; 4. Fig. 6 is a perspective view of the stylus arm and the supporting device therefor. Fig. .7 is a plan view of the sheet metal blank for'holding the stylus armspring.

Referring to t edrawing for a more pare ticular description of my invention, the numeral 1 designates the intake nipple provided with an annular flange 2, screw threaded upon its outer ed e, as at 3, to fit the interior screw threads 4 o the diaphragm ring 5. The die. hragm 6 is disposed between two circular as ets 7 which are clamped between the ower surface of the annular flan e 2, and the upper surface of the flange on t e ring 5, as

shown, more particularly in Fig. 1.

The stylus arm-or lever 6 is pivotally connected upon a pin 7 which passes through the lever 6 and through a pair of spaced ears 8 vertical section of a.

body of the plate for holding in connection therewith a pair ofspring wires 10 proends of the spring wires 10. are mounted bevided with spring coil's ll. The terminal tween two bearing members 12, 13, the member 12 being su ported upon a threaded pin 1 1- 'extending t ough the diaphragm ring and provided with a milled nut 15 for detachably'connecting the same to said ring. The lower member 13 is connected to the member 12 by means of a screw 16, and slots 17 are formed in the members 12 and 13 and disposed in alinement, as shown in Fi 4.-

The member 13 has a beveled lower w'a 18 which permits the two spring members 10 to lie in an inclined positionin the slots 17, and adjustingl screws 19 extend through the lower we. of the member 13 and are adapted the same- The s ring holdinilplate is provided with sideanges 20 w 'ch are ent over the body of the plate, and forming a reduced end2l which is supported in the limit loop 22, one end of which isthreaded, and

fitted with a milled nut 23 on its upper end, said threaded member assing through the diaphragm rin '5, and t e opposite member 24 of the limit oop extending into arecess in the lower portion of the diaphragm ring to provide an adjustment of the limit loop by means of a single nut. Connected to one end of the stylus arm or lever is a wire yoke-25, the upper end of which is connected to the button 26'secured centrally to the diaphragm 6, and ,,the lower end of said loop assing through ahole 27 in the supporting p ate.

The operation of my invention may be briefly described as follows: .When it is desired to adjust the tension of the stylus arm supporting spring, the set screws 19 are to bear against thesprings 10 for adjusting ad usted against the terminal ends of the springs 10 to raise and lower thestylus "arm relatively to the diaphragm to give a greater or lesser intensity to the re roduction.

From the foregoing it W1 1 be obvious that a reproducer or sound box made in accordance withmy invention does not require the use of a weight for the stylus arm, and that simple means are provided for adjusting the tension of the record.

Having thus described the invention, what Ivclaim 'is:

1. A sound reproducer for phonographs stylus and its bearing upon the p comprising a diaphra ring, a diaphragm seated therein, apair o sprin s,- a supporting plate for said springs, a sty us arm' ivoted to'said plate and connectedto said diap agm, and adjusting screws for regulating the tension of said springs.

2. ,A- reproducer for honographs comprising an intake nipple avingran annular flange, a diaphragm ring, a diap agm seated between said. flange and ring, a supporting plate, springs secured to said plate, means for supporting said springs at one side of the diaphragm ring, set screws for adjusting the tension of said springs, a stylus arm plvotally connected to said plate, and a yoke connected to the diaphragm button and to the stylus arm,

3. In a sound box f or phonographs, the combination of a supporting late, a air of springs connected to said p ate, adyustmg devices for said springs, a stylus arm gets to said late and connected to the diap agm, and a imit loop for supporting one end of the plate, said hrnit loop having a threaded shank fitted with a nut, and an unthreaded member seated in a recess in the diaphragm rin fn testimony whereof, I aflix my signature in presence of two witnesses.

ARTHUR O. MESTBAUD.

Witnessesi ,0. J. Jones, WILLARD E. STEWART. 

